LCD gamma correction by nonlinear digital-to-analogue converter

Harry G. Walton; Michael Brownlow; Jeremey Lock; Mouhamed Rahal; Patrick Zebedee

doi:10.1117/12.482576

16 May 2003 LCD gamma correction by nonlinear digital-to-analogue converter

Harry G. Walton, Michael Brownlow, Jeremey Lock, Mouhamed Rahal, Patrick Zebedee

Proceedings Volume 5004, Poly-Silicon Thin Film Transistor Technology and Applications in Displays and Other Novel Technology Areas; (2003) https://doi.org/10.1117/12.482576
Event: Electronic Imaging 2003, 2003, Santa Clara, CA, United States

Abstract

The non-linear transmission / voltage characteristic of the pixels of a liquid crystal display (LCD) must be corrected for during the digital-to-analogue conversion of image data. This process of gamma correction is conventionally performed by a combination of a digital look-up table and a linear digital-to-analogue converter (DAC) with a bit resolution, m, greater than the bit depth, n, of the digital image (m>n). We present a new method of LCD gamma correction based upon a carefully optimised non-linear DAC with a bit resolution of only n. By reducing DAC complexity we are able to reduce circuit area and move towards our vision of a fully integrated CGS, system-on-panel LCD.

Citation Download Citation

Harry G. Walton, Michael Brownlow, Jeremey Lock, Mouhamed Rahal, and Patrick Zebedee "LCD gamma correction by nonlinear digital-to-analogue converter", Proc. SPIE 5004, Poly-Silicon Thin Film Transistor Technology and Applications in Displays and Other Novel Technology Areas, (16 May 2003); https://doi.org/10.1117/12.482576

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